Cutter-head for rasp-punching machines



(No Model.)

A. WEED. GUTTERHEAD FOR RASP PUNOHING MACHINES.

No. 499,621. Patented June 13,1893.

witwa o I UNITED STATES PATENT OFFICE.

ALFRED \VEED, OF TARRYTOI/VN, NEW YORK.

CUTTER-HEAD FOR RASP-PUNCHING MACHINES.

SPECIFICATION forming part of Letters Patent No.499,621, dated June 13, 1893.

Application filed March 11, 1893- Serial No. 465,625. (No model.)

To all whom, it may concern.-

Be it known that I, ALFRED \VEED, residing in Tarrytown, Westchester county, New York, have invented certain new and useful Improvements in Cutter-Heads for Rasp-Punching Machines, of which the followingis a specification.

In the manufacture of rasps it is usual to make use of multiple cutters consisting in some cases of a series of chisels rigidly clamped together side by side and secured in a stock, or in other cases, the tool is in a single piece, ground to form a series of cutting points. The former construction is objectionable because in the cutting of rasps, it is exceedingly desirable that each cutter shall be allowed to accommodate itself to the characteristics of the particular portion of metal which it operates upon, sometimes a portion of a bar being heavier than others; and in certain classes of machines where the upturning action of the chisel is the result of the movement imparted by pressing the chisel having an inclined back edge into the metal, the binding of the chisels together results in straining the tool so that fractures frequently result inasmuch as there is a tendency in consequence either of the difierence of the metal which the chisels are working upon or of the inclination of the tools for one chisel to advance in front ahead of the other. The same result ensues when the chisels are all formed of a single block out or ground to constitute a number of points or cutters. Further, when the chisels are parts of a single block, the expense of grinding is great and in case of the breaking of a single chisel, the whole tool has to be discarded. In order to overcome these objections, I construct the cutter head as fully set forth hereinafter and as illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of my improved cutter head; Fig. 2, a front view; Fig. 3, a vertical section; Fig. 4, a transverse section.

The stock A is of any suitable form and proportions according to the character of the machine in which it is to be used and it is provided with a socket adapted to receive the heels of a series of chisels, 1, each of which has a pointed end and a beveled and sharpened back edge as illustrated. The chisels are arranged with their shanks lying in the socket of the stock with their front faces flush with each other and all bearing at the upper part against a spring, as for instance, ablock of rubber, 2, which is confined between the said front edges and a cross bar, 3, and of.

such thickness that when compressed in place between the cross bar and the shanks of the cutters or chisels, it will hold them firmly in place with their rear edges against the cross piece 4, constituting the back of the socket, the front portion of the socket being opened so as to permit the chisels to swing forward to the position shown in dotted lines, Fig. 3. When the tool is brought to the position shown in Fig. 3 or in some cases, slightly inclined with the points of the cutters in contact with the metal to be punctured, and pressure in a downward direction is applied, the back inclined edges of the cutters will cause the same to slide forward to the position shown in dotted lines, Fig. 3, thereby not only penetrating the metal, but moving forward so as to curl up a thin or lip of metal to form the tooth, the further lifting of the lip, resulting in some cases from inclining the stock to a slight extent. It will be seen that while the block of rubber or other spring pressure upon the fronts of the chisels tended to hold the lot together in a mass so as to act as a single tool, yet if there should be any difference in the angles which direct the courses of the chisels, or if the metal should be softer in some places than in others, each chisel can move to a slight extent independently of the others, so that there is no straining of the others in case of suchindependentmovement. Further,should either of the chisels be broken, it can be removed and replaced by another without affecting the character of the other. As soon as the tool is raised, the spring forces all of the chisels back to their first position. Owing to the fact that the socket is open at the front, each chisel can swing forward as required, while as all the chisels lie against the cross piece 4D in the same plane, any tilting of the stock which may be necessaryin raising some forms of teeth acts uniformly upon all the chisels after they have penetrated the metal.

Although I have illustrated a single block of rubber extending across all the chisels and serving to confine them all in place and acting as a spring for each, it will be evident that there may be a separate block for each chisel, or that any other spring material may be substituted for rubber.

Without limiting myself to the precise construction and arrangement of parts shown, I claim as my invention 1-. A cutter head for rasp cutting machines, consisting of a stock having a socket, a series of independent chisels arranged side by side in said socket, and each having its front bearin g against a spring arranged to hold the chisels in place in the socket, substantially as set forth.

2. The combination in a cutter head for rasp cutting machines, of a stock having a socket open at the front and with a cross piece 4 at the rear, a series of chisels having their shanks resting against said cross piece, with a spring bearing against the front edge of each chisel near the upper end, substantially as and for the purpose set forth.

3. The combination in a cutter head for rasp cutting machines, of a stock having a socket, aseries of chisels arranged within the said socket, a block 2 of rubber confined under pressure between the front edges of the chisels, and a cross piece substantially as and for the purpose set forth.

4. The combination of a stock having a socket, a series of chisels lying in said socket, each with an inclined rear edge, and a block of rubber compressed against the front edges of all of the chisels, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALFRED WEED.

\Vitnesses:

CHARLES E. FOSTER, F. L. FREEMAN. 

